基于TG-FTIR的大豆油热解特性研究  

Pyrolysis characteristics research of soybean oil based on the technique of TG-FTIR

作　　者：高龙超[1] 于凤文[1] 高明辉[1] 王玮瑾[1] 章国栋[1] 姬登祥[1] 计建炳[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,浙江省生物燃料利用技术研究重点实验室,浙江杭州310014

出　　处：《可再生能源》2013年第12期103-106,110,共5页Renewable Energy Resources

基　　金：教育部博士点基金项目(20103317110001)

摘　　要：利用热重-红外分析仪(TG-FTIR)研究了大豆油热解特性。通过大豆油热解产物的在线分析,验证了大豆油的热解机理,大豆油热解主要分为两个阶段:甘油三酯裂解阶段和由第1阶段生成的脂肪酸的裂解阶段。加入两种常用的油脂裂解催化剂碱性氧化物CaO和介孔分子筛MCM-41以考察油脂的催化裂解特性,两种催化剂对大豆油热解反应影响显著,使其热解终止温度升高,主要热解区间扩大,最大热解速率降低;由产物红外光谱图分析可知,CaO有较好的脱氧效果,MCM-41可以抑制酚类物质的生成。利用Coats-Redfern积分法计算大豆油主要热解区间的动力学参数,结果表明,在MCM-41催化下反应活化能降低,而CaO催化过程具有两个失重阶段,第1阶段活化能升高,第2阶段活化能降低。The pyrolysis characteristics of soybean oil were investigated using thermogravimetric analysis-Fourier transform infrared spectrometer （TG-FTIR）. The two stages of pyrolysis mechanism was proved by the on-line analysis of the pyrolysis products, the first stage is pyrolysis of triglyceride and the second is pyrolysis of the fatty acids derived from the first stage. The basic oxide CaO and mesoporous molecular sieve MCM-41 were added in the soybean oil to study the catalytic pyrolysis characteristics. As a result, the terminated pyrolysis temperature was raised, and the main pyrolysis region was widened, as well as the maximum pyrolysis rate reduced From the b-~fIR spectrogram study of the pyrolysis products, it can be concluded that the CaO had a good deoxygenated effect and the production of phenols would be restrained by MCM-41. The apparent kinetic parameters of the main pyrolysis interval were analyzed by the Coats-Redfern method. The results showed that the activation energy was lower in the presence of MCM-41, and as for CaO, the catalytic process with two weightlessness stage and lower for the second stage. stages, the activation energy was higher for the first

关 键 词：大豆油 热解 TG—FTIR 活化能 

分 类 号：TK6[动力工程及工程热物理—生物能] S216.2[农业科学—农业机械化工程]